1, the known valve control valve is the main type of the actuator, the control unit outputs a control signal by receiving the adjustment means to change the power-operated fluid flow. Generally valve actuator and valve components. If by their use with actuators, control valves can be divided into pneumatic, electric, hydraulic three, that compressed air pneumatic valve power source to electrical power source for the electric control valve, the liquid medium (such as oil) pressure-powered electric hydraulic control valve, in addition, their functions and features points, as well as solenoid valves, electronic, smart, fieldbus-based control valve. Many types of valve products, structures are also diverse, but also constantly updated and changed. Generally speaking valve is universal, both matching and pneumatic actuators can also be matched with electric actuator or other executive agencies. 2, select the type of valve control valve body type selection valve body choice is to select the most important aspects. Valve of many types of commonly used through single-seat, two-seater 10 kinds of straight, angular, diaphragm, low flow, tee, eccentric rotation, butterfly sleeve, ball and so on. Before selecting a valve, you want to medium, process conditions and parameters of the control process of careful analysis, to collect enough data to understand the system requirements of the regulating valve, the valve type based on the data collected to determine which to use. In the specific choices available from the following aspects: 1) the shape of the structure of the spool main consideration according to the selected flow characteristics and unbalanced forces and other factors. (2) wear resistance when the fluid medium is a suspension containing a high concentration of abrasive particles, valve, valve seat joints every closed will be subject to serious friction. Therefore, the valve flow path to be smooth, the valve inside the material to be hard. (3) corrosion as a corrosive medium, to meet regulatory function in the case, try to choose a simple valve. Temperature (4) media pressure when the medium temperature, high pressure and great change, should be chosen disc and seat materials affected by temperature and pressure changes in a small valve. (5) to prevent steam and air steam and air only in a liquid medium. In the actual production process, steam and air not only affects the calculation of flow coefficient, but also the formation of vibration and noise, so that the shorter the life of the valve, so when selecting a valve to prevent the valve flash [Company Name] Tengzhou Hang Noda Machine Co., Ltd. [Sales Manager] Mr. Sun [Sales Hotline] 0632-5168661 [Business Phone] 13356372661 [Main products] small hydraulic machine hydraulic machine of a single column hydraulic press gantry hydraulic machine hydraulic machine of a single column hydraulic press four-column universal hydraulic machine small hydraulic machine manufacturers single hydraulic arm [corporate website] http://www.xc-yyj.com/ http://www.shukongxichuang5.com/ http://www.shukongxichuang6.com/ [Address] Tengzhou City Economic Development Zone Industrial Park South area